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1
Wisconsin Hosta Society
Hosta Diseases
Brian D. Hudelson
Department of Plant Pathology
University of Wisconsin-Madison/Extension
• Pathogen: Sclerotium rolfsii
• Hosts
– Hosta
– Bedding plants
– Many other herbaceous annuals and perennials
– Some woody ornamentals
Hosta Diseases
Southern Blight
• Control– DO NOT buy infected/infested plants
– Avoid cocoa mulch (????)
– Remove infected plants, mulch and soil• Double bag
• Landfill
– Disinfest contaminated materials
• 10% bleach
• 70% alcohol
• Commercial disinfectants
Hosta Diseases
Southern Blight
• Control– Use fungicides for control
• Triadimefon
• 14 – 28 day intervals
– Pray for a cold winter
Hosta Diseases
Southern Blight
• Cause: Hosta virus X virus (HVX)
• Host: Hosta
– ‘Gold Edger’, ‘Gold Standard’, ‘Golden
Tiara’, ‘Striptease’, ‘Sum and Substance’
• Transmission: Mechanical
– Tools
• Shovels
• String edgers
– Touch
Hosta Diseases
Hosta Virus X
2
hostalibrary.org/firstlook/HVX.htm
• Control
– Buy hostas from reputable sources
– Inspect hostas prior to purchase for symptoms of HVX
– Request that hostas be tested for HVX prior
to purchase
– Keep new hostas isolated from established hostas